<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">
<head>
	<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
	<title>大牛学习</title>
    <style type="text/css">
    
    .header{
    	width: 100%;
    	height: 80px;
        background-color: black;
    }
    .main{
    	margin: 0px auto;
    	width: 70%;
    	height: 700px;
        background-color: red;
      
    }
    .footer{
    	margin: 0px auto;
    	width: 70%;
    	height: 200px;
        background-color: blue;
    }
    	</style>
</head>
<body>
	<div class="header">
		<font color="white">大牛学院</font>

	</div>
	</br>
	</br>
	</br>
	</br>

	<div class="main">
		<h2><strong>教学服务</strong></h2>
        
     
	</div>
    </br>
    </br>
    </br>
    </br>

    <div class="footer">
    您可能遇到的问题
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</body>
</html>